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Finding the Fourth Proportional to 815.82, 1,126.08 and 651.17

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Solution

The fourth proportional to 815.82, 1,126.08 and 651.17 is: 898.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.82 : 1,126.08 = 651.17 : x
  2. Step 2: Convert to fraction form
    815.82/1,126.08 = 651.17/x
  3. Step 3: Cross multiply
    815.82x = 1,126.08 × 651.17
  4. Step 4: Simplify right side
    815.82x = 733,263.88
  5. Step 5: Solve for x
    x = 733,263.88/815.82
  6. Step 6: Final answer
    x = 898.81

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.